Amazon.com: [2 PACK] 23 inch Anti Glare (Matte) Screen Protector Compatible for All Brands of 23" Widescreen Desktop with 16:9 Aspect Ratio Monitor [!!!Not for 16:10 Aspect Ratio Monitor] : Electronics
Office Depot
Kantek LCD Protect Deluxe Anti-Glare Filter for 19 to 20 Inch Widescreen LCD Monitors (LCD20W) : Amazon.in: Computers & Accessories
Anti-Glare and Blue Light Reduction Filter for 23.8" Monitors | Anti-Glare and Blue Light Filters | Kensington
eye strain - How can I reduce glare on my computer monitor? - Super User
3M Anti-Glare Filter for 19" Widescreen Monitor AG190W1B B&H